Iran TV says authorities disrupted 'biggest terrorist plot'

This picture taken on Monday, June 6, 2016 shows a general view of Tehran, Iran. Iranian intelligence officials have broken up one of the "biggest terrorist" plots ever planned to target Tehran and other provinces in the Islamic Republic, the country's state media reported on Monday. (AP Photo/Vahid Salemi) (The Associated Press)

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This picture taken on Monday, June 6, 2016, shows a general view of Tehran, Iran. Iranian intelligence officials have broken up one of the "biggest terrorist" plots ever planned to target Tehran and other provinces in the Islamic Republic, the country's state media reported on Monday. (AP Photo/Vahid Salemi) (The Associated Press)

Monday's report quotes the Intelligence Ministry as saying several suspects have been arrested in the plot to bomb the capital and other provinces.

It says authorities seized bombs and ammunition during the operation. The report didn't identify those arrested, though it called them "takfiris," a derogatory term in both Arabic and Farsi referring to Muslims who accuse others of being "nonbelievers."

Iranian authorities often refer to followers of the Sunni militant Islamic State group as "takfiris," though it isn't clear if this case involved the extremist group that holds territory in Iraq and Syria.

Shiite power Iran has been helping both the Syrian and the Iraqi government in their battles against the Islamic State group.